Merge: lib-src changes mostly to avoid GCC warnings

6 files changed, 143 insertions, 96 deletions

diff --git a/lib-src/ChangeLog b/lib-src/ChangeLog
index 2c98cdf59a6..ba77a92cf17 100644
--- a/lib-src/ChangeLog
+++ b/lib-src/ChangeLog
@@ -1,3 +1,49 @@
+2011-02-26  Paul Eggert  <eggert@cs.ucla.edu>
+
+	* ebrowse.c (parse_qualified_param_ident_or_type): Make it clear
+	to reader (and to the compiler) that the loop always executes at
+	least once.  This prevents a warning with recent GCC.
+	(BROWSE_STRUCT): Remove unused macro.
+
+	* fakemail.c: Include <ignore-value.h>.
+	(put_line): Explicitly ignore fwrite return value, for benefit of
+	recent glibc + gcc.
+	(close_the_streams): Diagnose output errors instead of merely
+	exiting with nonzero status.
+	(my_fclose, main): Diagnose input errors, and exit with nonzero status.
+	Formerly, input errors were silently ignored.
+
+	* ebrowse.c (putstr): Rename from PUTSTR and turn into a function.
+	All callers changed.  This is cleaner, and avoids GCC warnings about
+	passing NULL to fputs.
+	(insert_keyword): Rename parameter to avoid shadowing diagnostic.
+
+2011-02-25  Paul Eggert  <eggert@cs.ucla.edu>
+
+	* emacsclient.c (main): Avoid dangling 'if'.
+	(xstrdup): Remove; no longer needed.
+	(get_current_dir_name, w32_getenv, get_server_config, find_tty):
+	(set_local_socket, main):
+	Use const char *, not char *, for pointers that are not assigned
+	through.
+	(IF_LINT): New macro.
+	(set_local_socket, main): Use it to suppress warnings with
+	GCC -Wuninitialized.
+
+	* emacsclient.c: Redo local variables to avoid shadowing problems.
+	(message, socket_status, start_daemon_and_retry_set_socket):
+	Rename locals.
+	(main): Move decl of "i".
+
+	* etags.c (ISUPPER): Move to inside the only #ifdef where it's used.
+	This avoids an unused-macro warning with some GCC settings.
+
+	* make-docfile.c (write_globals): Change char * to char const *
+	to avoid a GCC "assignment discards qualifiers" diagnostic
+	in some configurations.
+	(scan_c_file): Refactor local variable decls to make their scope
+	more accurate and to avoid a GCC -Wuninitialized diagnostic.
+
 2011-02-22  Eli Zaretskii  <eliz@gnu.org>
 
 	* etags.c (canonicalize_filename, ISUPPER): Fix last change.
diff --git a/lib-src/ebrowse.c b/lib-src/ebrowse.c
index f2894d5a0c2..113b6fdfe40 100644
--- a/lib-src/ebrowse.c
+++ b/lib-src/ebrowse.c
@@ -77,7 +77,6 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #define TREE_HEADER_STRUCT	"[ebrowse-hs "
 #define TREE_STRUCT		"[ebrowse-ts "
 #define MEMBER_STRUCT		"[ebrowse-ms "
-#define BROWSE_STRUCT		"[ebrowse-bs "
 #define CLASS_STRUCT		"[ebrowse-cs "
 
 /* The name of the symbol table entry for global functions, variables,
@@ -1108,22 +1107,23 @@ leave_namespace (void)
 /* Write string S to the output file FP in a Lisp-readable form.
    If S is null, write out `()'.  */
 
-#define PUTSTR(s, fp)				\
-  do {						\
-    if (!s)					\
-      {						\
-        putc ('(', fp);				\
-        putc (')', fp);				\
-        putc (' ', fp);				\
-      }						\
-    else					\
-      {						\
-        putc ('"', fp);				\
-        fputs (s, fp);				\
-        putc ('"', fp);				\
-        putc (' ', fp);				\
-      }						\
-   } while (0)
+static inline void
+putstr (const char *s, FILE *fp)
+{
+  if (!s)
+    {
+      putc ('(', fp);
+      putc (')', fp);
+      putc (' ', fp);
+    }
+  else
+    {
+      putc ('"', fp);
+      fputs (s, fp);
+      putc ('"', fp);
+      putc (' ', fp);
+    }
+}
 
 /* A dynamically allocated buffer for constructing a scope name.  */
 
@@ -1216,16 +1216,16 @@ dump_members (FILE *fp, struct member *m)
   for (n = 0; m; m = m->next, ++n)
     {
       fputs (MEMBER_STRUCT, fp);
-      PUTSTR (m->name, fp);
-      PUTSTR (NULL, fp);		/* FIXME? scope for globals */
+      putstr (m->name, fp);
+      putstr (NULL, fp);		/* FIXME? scope for globals */
       fprintf (fp, "%u ", (unsigned) m->flags);
-      PUTSTR (m->filename, fp);
-      PUTSTR (m->regexp, fp);
+      putstr (m->filename, fp);
+      putstr (m->regexp, fp);
       fprintf (fp, "%u ", (unsigned) m->pos);
       fprintf (fp, "%u ", (unsigned) m->vis);
       putc (' ', fp);
-      PUTSTR (m->def_filename, fp);
-      PUTSTR (m->def_regexp, fp);
+      putstr (m->def_filename, fp);
+      putstr (m->def_regexp, fp);
       fprintf (fp, "%u", (unsigned) m->def_pos);
       putc (']', fp);
       putc ('\n', fp);
@@ -1243,20 +1243,20 @@ static void
 dump_sym (FILE *fp, struct sym *root)
 {
   fputs (CLASS_STRUCT, fp);
-  PUTSTR (root->name, fp);
+  putstr (root->name, fp);
 
   /* Print scope, if any.  */
   if (root->namesp)
-    PUTSTR (sym_scope (root), fp);
+    putstr (sym_scope (root), fp);
   else
-    PUTSTR (NULL, fp);
+    putstr (NULL, fp);
 
   /* Print flags.  */
   fprintf (fp, "%u", root->flags);
-  PUTSTR (root->filename, fp);
-  PUTSTR (root->regexp, fp);
+  putstr (root->filename, fp);
+  putstr (root->regexp, fp);
   fprintf (fp, "%u", (unsigned) root->pos);
-  PUTSTR (root->sfilename, fp);
+  putstr (root->sfilename, fp);
   putc (']', fp);
   putc ('\n', fp);
 }
@@ -1323,7 +1323,7 @@ dump_roots (FILE *fp)
   if (!f_append)
     {
       fputs (TREE_HEADER_STRUCT, fp);
-      PUTSTR (EBROWSE_FILE_VERSION, fp);
+      putstr (EBROWSE_FILE_VERSION, fp);
 
       putc ('\"', fp);
       if (!f_structs)
@@ -2062,11 +2062,11 @@ re_init_scanner (void)
 }
 
 
-/* Insert a keyword NAME with token value TK into the keyword hash
+/* Insert a keyword NAME with token value TKV into the keyword hash
    table.  */
 
 static void
-insert_keyword (const char *name, int tk)
+insert_keyword (const char *name, int tkv)
 {
   const char *s;
   unsigned h = 0;
@@ -2077,7 +2077,7 @@ insert_keyword (const char *name, int tk)
 
   h %= KEYWORD_TABLE_SIZE;
   k->name = name;
-  k->tk = tk;
+  k->tk = tkv;
   k->next = keyword_table[h];
   keyword_table[h] = k;
 }
@@ -2951,7 +2951,9 @@ parse_qualified_param_ident_or_type (char **last_id)
   static char *id = NULL;
   static int id_size = 0;
 
-  while (LOOKING_AT (IDENT))
+  assert (LOOKING_AT (IDENT));
+
+  do
     {
       int len = strlen (yytext) + 1;
       if (len > id_size)
@@ -2974,6 +2976,7 @@ parse_qualified_param_ident_or_type (char **last_id)
       else
 	break;
     }
+  while (LOOKING_AT (IDENT));
 }
 
 
diff --git a/lib-src/emacsclient.c b/lib-src/emacsclient.c
index 8d5f0482637..251f35873e3 100644
--- a/lib-src/emacsclient.c
+++ b/lib-src/emacsclient.c
@@ -112,6 +112,13 @@ char *(getcwd) (char *, size_t);
 /* Additional space when allocating buffers for filenames, etc.  */
 #define EXTRA_SPACE 100
 
+/* Use this to suppress gcc's `...may be used before initialized' warnings. */
+#ifdef lint
+# define IF_LINT(Code) Code
+#else
+# define IF_LINT(Code) /* empty */
+#endif
+
 
 /* Name used to invoke this program.  */
 const char *progname;
@@ -190,20 +197,6 @@ xmalloc (unsigned int size)
   return result;
 }
 
-/* Like strdup but get a fatal error if memory is exhausted. */
-
-static char *
-xstrdup (const char *s)
-{
-  char *result = strdup (s);
-  if (result == NULL)
-    {
-      perror ("strdup");
-      exit (EXIT_FAILURE);
-    }
-  return result;
-}
-
 /* From sysdep.c */
 #if !defined (HAVE_GET_CURRENT_DIR_NAME) || defined (BROKEN_GET_CURRENT_DIR_NAME)
 
@@ -233,7 +226,7 @@ char*
 get_current_dir_name (void)
 {
   char *buf;
-  char *pwd;
+  const char *pwd;
   struct stat dotstat, pwdstat;
   /* If PWD is accurate, use it instead of calling getwd.  PWD is
      sometimes a nicer name, and using it may avoid a fatal error if a
@@ -353,7 +346,7 @@ w32_getenv (char *envvar)
     {
       /* "w32console" is what Emacs on Windows uses for tty-type under -nw.  */
       if (strcmp (envvar, "TERM") == 0)
-	return xstrdup ("w32console");
+	return "w32console";
       /* Found neither in the environment nor in the registry.  */
       return NULL;
     }
@@ -474,13 +467,13 @@ ttyname (int fd)
 /* Display a normal or error message.
    On Windows, use a message box if compiled as a Windows app.  */
 static void
-message (int is_error, const char *message, ...)
+message (int is_error, const char *format, ...)
 {
   char msg[2048];
   va_list args;
 
-  va_start (args, message);
-  vsprintf (msg, message, args);
+  va_start (args, format);
+  vsprintf (msg, format, args);
   va_end (args);
 
 #ifdef WINDOWSNT
@@ -918,7 +911,7 @@ get_server_config (struct sockaddr_in *server, char *authentication)
     config = fopen (server_file, "rb");
   else
     {
-      char *home = egetenv ("HOME");
+      const char *home = egetenv ("HOME");
 
       if (home)
         {
@@ -1025,10 +1018,10 @@ strprefix (const char *prefix, const char *string)
    is zero, or return 0 if NOABORT is non-zero.  */
 
 static int
-find_tty (char **tty_type, char **tty_name, int noabort)
+find_tty (const char **tty_type, const char **tty_name, int noabort)
 {
-  char *type = egetenv ("TERM");
-  char *name = ttyname (fileno (stdout));
+  const char *type = egetenv ("TERM");
+  const char *name = ttyname (fileno (stdout));
 
   if (!name)
     {
@@ -1080,11 +1073,11 @@ find_tty (char **tty_type, char **tty_name, int noabort)
    0 - success: none of the above */
 
 static int
-socket_status (char *socket_name)
+socket_status (char *name)
 {
   struct stat statbfr;
 
-  if (stat (socket_name, &statbfr) == -1)
+  if (stat (name, &statbfr) == -1)
     return 2;
 
   if (statbfr.st_uid != geteuid ())
@@ -1205,7 +1198,7 @@ set_local_socket (void)
     int default_sock = !socket_name;
     int saved_errno = 0;
     const char *server_name = "server";
-    const char *tmpdir;
+    const char *tmpdir IF_LINT ( = NULL);
 
     if (socket_name && !strchr (socket_name, '/')
 	&& !strchr (socket_name, '\\'))
@@ -1260,10 +1253,10 @@ set_local_socket (void)
 	   associated with the name.  This is reminiscent of the logic
 	   that init_editfns uses to set the global Vuser_full_name.  */
 
-	char *user_name = (char *) egetenv ("LOGNAME");
+	const char *user_name = egetenv ("LOGNAME");
 
 	if (!user_name)
-	  user_name = (char *) egetenv ("USER");
+	  user_name = egetenv ("USER");
 
 	if (user_name)
 	  {
@@ -1483,8 +1476,8 @@ start_daemon_and_retry_set_socket (void)
   else
     {
       char emacs[] = "emacs";
-      char daemon[] = "--daemon";
-      char *d_argv[] = {emacs, daemon, 0 };
+      char daemon_option[] = "--daemon";
+      char *d_argv[] = {emacs, daemon_option, 0 };
       if (socket_name != NULL)
 	{
 	  /* Pass  --daemon=socket_name as argument.  */
@@ -1504,10 +1497,12 @@ start_daemon_and_retry_set_socket (void)
 int
 main (int argc, char **argv)
 {
-  int i, rl, needlf = 0;
+  int rl, needlf = 0;
   char *cwd, *str;
   char string[BUFSIZ+1];
-  int null_socket_name, null_server_file, start_daemon_if_needed;
+  int null_socket_name IF_LINT ( = 0);
+  int null_server_file IF_LINT ( = 0);
+  int start_daemon_if_needed;
   int exit_status = EXIT_SUCCESS;
 
   main_argv = argv;
@@ -1543,21 +1538,21 @@ main (int argc, char **argv)
       null_server_file = (server_file == NULL);
     }
 
-  if ((emacs_socket = set_socket (alternate_editor
-				  || start_daemon_if_needed)) == INVALID_SOCKET)
-    if (start_daemon_if_needed)
-      {
-	/* Reset socket_name and server_file if they were NULL
-	   before the set_socket call.  */
-	if (null_socket_name)
-	  socket_name = NULL;
-	if (null_server_file)
-	  server_file = NULL;
-
-	start_daemon_and_retry_set_socket ();
-      }
-    else
-      fail ();
+  emacs_socket = set_socket (alternate_editor || start_daemon_if_needed);
+  if (emacs_socket == INVALID_SOCKET)
+    {
+      if (! start_daemon_if_needed)
+	fail ();
+
+      /* Reset socket_name and server_file if they were NULL
+	 before the set_socket call.  */
+      if (null_socket_name)
+	socket_name = NULL;
+      if (null_server_file)
+	server_file = NULL;
+
+      start_daemon_and_retry_set_socket ();
+    }
 
   cwd = get_current_dir_name ();
   if (cwd == 0)
@@ -1615,7 +1610,7 @@ main (int argc, char **argv)
      frame is available.  */
   if (tty || (current_frame && !eval))
     {
-      char *tty_type, *tty_name;
+      const char *tty_type, *tty_name;
 
       if (find_tty (&tty_type, &tty_name, !tty))
 	{
@@ -1635,6 +1630,7 @@ main (int argc, char **argv)
 
   if ((argc - optind > 0))
     {
+      int i;
       for (i = optind; i < argc; i++)
 	{
 
diff --git a/lib-src/etags.c b/lib-src/etags.c
index b738f0f4564..385e4cc9721 100644
--- a/lib-src/etags.c
+++ b/lib-src/etags.c
@@ -236,7 +236,6 @@ If you want regular expression support, you should delete this notice and
 #define ISALNUM(c)	isalnum (CHAR(c))
 #define ISALPHA(c)	isalpha (CHAR(c))
 #define ISDIGIT(c)	isdigit (CHAR(c))
-#define ISUPPER(c)	isupper (CHAR(c))
 #define ISLOWER(c)	islower (CHAR(c))
 
 #define lowcase(c)	tolower (CHAR(c))
@@ -6648,6 +6647,7 @@ canonicalize_filename (register char *fn)
 
 #ifdef DOS_NT
   /* Canonicalize drive letter case.  */
+# define ISUPPER(c)	isupper (CHAR(c))
   if (fn[0] != '\0' && fn[1] == ':' && ISUPPER (fn[0]))
     fn[0] = lowcase (fn[0]);
 
diff --git a/lib-src/fakemail.c b/lib-src/fakemail.c
index 26375a61654..780a104b405 100644
--- a/lib-src/fakemail.c
+++ b/lib-src/fakemail.c
@@ -62,6 +62,8 @@ main ()
 
 /* This is to declare cuserid.  */
 #include <unistd.h>
+
+#include <ignore-value.h>
 
 /* Type definitions */
 
@@ -405,8 +407,8 @@ close_the_streams (void)
   for (rem = the_streams;
        rem != ((stream_list) NULL);
        rem = rem->rest_streams)
-    no_problems = (no_problems &&
-		   ((*rem->action) (rem->handle) == 0));
+    if (no_problems && (*rem->action) (rem->handle) != 0)
+      error ("output error", NULL);
   the_streams = ((stream_list) NULL);
   return (no_problems ? EXIT_SUCCESS : EXIT_FAILURE);
 }
@@ -427,6 +429,8 @@ my_fclose (FILE *the_file)
 {
   putc ('\n', the_file);
   fflush (the_file);
+  if (ferror (the_file))
+    return EOF;
   return fclose (the_file);
 }
 
@@ -496,7 +500,7 @@ put_line (const char *string)
 		}
 	    }
 	  /* Output that much, then break the line.  */
-	  fwrite (s, 1, breakpos - s, rem->handle);
+	  ignore_value (fwrite (s, 1, breakpos - s, rem->handle));
 	  column = 8;
 
 	  /* Skip whitespace and prepare to print more addresses.  */
@@ -729,6 +733,9 @@ main (int argc, char **argv)
       put_string (buf);
     }
 
+  if (no_problems && (ferror (stdin) || fclose (stdin) != 0))
+    error ("input error", NULL);
+
   exit (close_the_streams ());
 }
 
diff --git a/lib-src/make-docfile.c b/lib-src/make-docfile.c
index f0aa222986a..f900ea42e91 100644
--- a/lib-src/make-docfile.c
+++ b/lib-src/make-docfile.c
@@ -617,7 +617,7 @@ write_globals (void)
   qsort (globals, num_globals, sizeof (struct global), compare_globals);
   for (i = 0; i < num_globals; ++i)
     {
-      char *type;
+      char const *type;
 
       switch (globals[i].type)
 	{
@@ -658,12 +658,8 @@ scan_c_file (char *filename, const char *mode)
   FILE *infile;
   register int c;
   register int commas;
-  register int defunflag;
-  register int defvarperbufferflag;
-  register int defvarflag;
   int minargs, maxargs;
   int extension = filename[strlen (filename) - 1];
-  enum global_type type;
 
   if (extension == 'o')
     filename[strlen (filename) - 1] = 'c';
@@ -693,6 +689,10 @@ scan_c_file (char *filename, const char *mode)
   while (!feof (infile))
     {
       int doc_keyword = 0;
+      int defunflag = 0;
+      int defvarperbufferflag = 0;
+      int defvarflag = 0;
+      enum global_type type = INVALID;
 
       if (c != '\n' && c != '\r')
 	{
@@ -726,7 +726,6 @@ scan_c_file (char *filename, const char *mode)
 	    continue;
 
 	  defvarflag = 1;
-	  defunflag = 0;
 
 	  c = getc (infile);
 	  defvarperbufferflag = (c == 'P');
@@ -738,8 +737,6 @@ scan_c_file (char *filename, const char *mode)
 		type = LISP_OBJECT;
 	      else if (c == 'B')
 		type = BOOLEAN;
-	      else
-		type = INVALID;
 	    }
 
 	  c = getc (infile);
@@ -758,8 +755,6 @@ scan_c_file (char *filename, const char *mode)
 	    continue;
 	  c = getc (infile);
 	  defunflag = c == 'U';
-	  defvarflag = 0;
-	  defvarperbufferflag = 0;
 	}
       else continue;